How acrylic sheet is made
Acrylic is the clear plastic sold as Plexiglas, and it was first marketed in 1933.
- stations
- 5
- things upstream
- 11
- raw sources
- 5
- steps from the ground
- 4
The short version
Acrylic is polymethyl methacrylate. Its monomer, methyl methacrylate, is made from petrochemicals and then polymerized. For clear sheet, a partly-reacted syrup is poured between two flat plates and cured in an oven. Pellets for extrusion and molding are made by running the same reaction in a continuous reactor.
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Build the monomer
Propylene and ammonia-derived chemicals are combined in a multistep route that ends with methyl methacrylate, a clear liquid. Sulfuric acid is used as a reagent along the way.
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Make a thick syrup
The liquid is warmed with a small amount of initiator until it partly polymerizes into a syrupy mix. That makes the next step manageable.
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Cast it between glass plates
Syrup is poured into a cell made of two flat, polished plates sealed with a gasket. Those plates give the finished sheet its glossy, flawless face.
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Cure it slowly in an oven
Gentle heat over hours hardens the syrup into a solid sheet. Heating slowly keeps the plastic free of bubbles.
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Pop the plates and trim
The plates are separated from the clear sheet, which is then trimmed and covered in protective masking. Thin or continuous sheet is made by extrusion instead.
Worth repeating
- During World War II, both Allied and Axis forces used acrylic glass for submarine periscopes and for aircraft windscreens, canopies and gun turrets.
- Acrylic is also sold as Plexiglas, Perspex, Lucite and Acrylite.
- British chemists Rowland Hill and John Crawford at ICI discovered poly(methyl methacrylate) in the early 1930s.
Back to the ground
Follow every input upstream and acrylic starts as these 5 raw sources.
Everything it is made of See it on the map
Open the whole family tree
Where it goes next
Acrylic feeds 6 lines directly and reaches 186 things in total.
Further down the line
Keep walking
Sources
Cite this page: "How acrylic sheet is made." Assembly Line, 2026-11-03. https://assemblyline.org/make/acrylic